If I read correctly in the Bryce3 and Poser3 manuals, bump maps are handled opposite of each other. In other words, where one (Poser) has the black areas of the bump map raised, the other (Bryce) reads white as raised. When importing to Bryce it should be easy to inverse the bump map or else just assign a negitive bump value. Remember that in the material editor, the far right box will tell you what your bump output will be. Haven't dug into the Bryce4 manual yet so I'm not sure if it handles the bump maps the same but I suspect it does. Hope that helps